head to head
vs
Rainbow Six SiegevsTom Clancy's Rainbow Six: Vegas
Rainbow Six Siege leans Reads (Grand Arena); Tom Clancy's Rainbow Six: Vegas leans Execution (Competitive PvP).
Rainbow Six SiegeTom Clancy's Rainbow Six: Vegas
Axis by axis
Execution7 vs 7
Even - both lean on execution about the same.
Reads9 vs 5
Rainbow Six Siege leans harder on reads: Defenders adapt holds; attackers fake and bait.
Variance2 vs 2
Even - both lean on variance about the same.
Optimization6 vs 5
Rainbow Six Siege leans harder on optimization: Operator picks, gadget placement, and utility usage.
Two games can score the same on an axis and still test it in very different ways - read each rationale, not just the number.